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TRANSMISSION SWAP
Posted: Sun Apr 28, 2013 4:49 pm
by berry
dear all
is it theoretically possible to swap my 3T40 with a new one, for example with a GM 5L40-E trans or something similar??
I d love to have at least a 5 gear-automatic someday

is there anyone out there with knowledge on this topic?
thanks for your help!
Re: TRANSMISSION SWAP
Posted: Sun Apr 28, 2013 6:14 pm
by Money pit Beretta
You could do it if you had a stand alone computer. The other problem would be mounts.
Re: TRANSMISSION SWAP
Posted: Sun Apr 28, 2013 7:22 pm
by berry
crap. I meant the transverse ones like 6T40 not the longitudinal stuff. sorry.
does it change your answer?
Re: TRANSMISSION SWAP
Posted: Sun Apr 28, 2013 7:46 pm
by Asylum
The 3t40 (TH125) is a stand alone cable controlled transaxle.
No electronics at all.
So you will need to find/obtain the necessary ECU to make the new trans work.
That is assuming you can get mounts fabbed to keep it in place and axles the right length.
Bolt pattern? Going to need new wheels.
Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 8:57 am
by woody90gtz
The new electronic automatics also need feedback from the engine, etc, so you will need to be able to add those to a standalone computer or OEM ECM. Will not be easy, just from the electronics side. And then you have the mounts and axles to deal with as stated earlier.
Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 10:42 am
by berry
I see. to swap a engine is a little bit easier than to swap a trans.

Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 10:44 am
by berry
maybe I should rather swap the platform (from L to epsilon or so) than to swap the trans

Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 1:53 pm
by Money pit Beretta
Berry wrote:crap. I meant the transverse ones like 6T40 not the longitudinal stuff. sorry.
does it change your answer?
LOL somehow I read the "L" as a "T" anyway. I knew what you were talking about though.
Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 3:28 pm
by berry
A kind of autocorrecting view

Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 3:35 pm
by woody90gtz
I try not to look at that automatic language. I've already had a 4T60E and 4L60E and dumped them both for manuals. haha
Re: TRANSMISSION SWAP
Posted: Mon Apr 29, 2013 4:04 pm
by berry
I like manuals too, but in the traffic jam it's a pain in the ass. anyway, maybe I should forget my automatic-swap-project and look for a second retta with manual
Re: TRANSMISSION SWAP
Posted: Thu May 02, 2013 7:22 pm
by berry
anyway, thanks for your answers guys!!
Re: TRANSMISSION SWAP
Posted: Thu May 02, 2013 8:25 pm
by Money pit Beretta
It never hurts to ask.
Re: TRANSMISSION SWAP
Posted: Thu May 02, 2013 11:45 pm
by ronaconda
Non-e 4t60...it is non-electronic and will add a fourth gear...
Re: TRANSMISSION SWAP
Posted: Fri May 03, 2013 1:01 am
by berry
are you talking about the 440-t4 from the years 1985-1989?
ronaconda wrote:Non-e 4t60...it is non-electronic and will add a fourth gear...